Reinforcement system for concrete columns.



R. B. HARTMAN.

REINFORCEMENT SYSTEM FOR CONCRETE COLUMNS.

APPLICATION I'ILBDMAPRLZS, 1907- Patented Mar.'24, 1914.

UNITED STATES PATENT OFFICE. I

RUDOLPH B. HARTMAN, 0F MILWAUKEE, WISCONSIN.

REINFORCEMENT SYSTEM FOR CONCRETE COLUMNS.

To all whom it may concern Be it known that I, RUDOLPH B. HART- MAN, of Milwaukee, Wisconsin, have .invented a Reinforcement System for Concrete Columns, of which the following is a specification.

My invention relates to structural concrete work, and has to do more particularly with that which is known as armored or reinforced concrete, in which metal and concrete are united together to form beams, slabs, columns, piers, chimneys, and other structural forms.

In my present invention I design to improve on former methods of reinforcing columns, by providing improved skeleton frame work for the columns.

My invention consists of the constructions and combinations which will be hereinafter explained in connection with the accompanying drawings, wherein Figure 1 is a side elevation of one form of skeleton structure according to my invention; Fig. 2 is a similar view of another form of skeleton structure; Fig. 3 is a plansection on the plane 3 of Fig. 2, only the hoop nearest the plane of section being shown to avoid obscurity; Fig. 4: is a plansection on the plane 4 of Fig. 2, only the hoop nearest the plane of section being shown to avoid obscurity; Figs. 5 to 9, in elusive, show various forms of reinforcing hoops for the skeleton-frames of differently shaped columns.

In these drawings every reference letter and numeral refers to the same part whereever used.

My improved construction consists, in general, in making a selfsustaining skeleton-frame whose parts are held in proper relation by friction only, thus avoiding the necessity of special devices for holding the frame together. In order to effect this, the reinforcing-girths or hoops which embrace the longitudinal rods are so constructed and arranged that they produce upon the said longitudinal rods slight bending forces alternately in opposite directions, said bending forces being of a resilient nature and producting a frictional pressure between the several pieces which is suflicient to hold them in place while the framework is being erected and to allow of'its being handled and transported from place to place as a whole without disarrangement.

In Fig. 1 is shown one plan of producing 1 sets of longitudinal rods;

Specification of Letters Patent.

Patented Mar. 24, 1914.

Application filed April 23, 1907. Serial No. 369,764.

aforesaid opposite slight bending-stresses upon the longitudinal rods; in this case the reinforcing girths a which embrace the longitudinal bars 6 are all alike, and they are prov ded with eyes 0 turned at the corners, through which the rods 6 pass, said eyes more or less closely embracing the rods 6. L hen the girths a are in place,.they are shifted or skewed alternately in opposite directions as shown, thus producing opposite slight fiexu'ral stresses in the longitudinals I) which counterbalance each other. Of course, corresponding stresses which pro duce a greater amount OfflBXlllG are set up in the "girths a, action and reaction being equal as in all cases. The longitudinals 6, being in common practice much stouter than the girths a, their flexure would not be sensible to the eye so it is not shown on the drawing. It will be seenjthat the opposing flexural stresses in the members a and b can be made to produce considerable binding forces at the eyes 0, that is to say, frictional contact: between the members, which is amply suflicient to hold them in relative position.

Fig. 2 shows another method of producing the same result. In this case the flexiiral stresses in the longitudinals b are brought about by making the reinforcing girths alternately larger and smaller, so that the smaller ones act as ties to pull the rods 1) together, and the larger ones as struts to push them apart. The tie-girths a do not require any eyes at the corners; these, therefore, are omitted. The strut-girths a" necessarily have eyes, as shown in Fig. 3. These girths are shown in the drawing as of larger diameter than the girths a, -merely to illustrate to the eye that they are struts and not ties; in actual practice they are of the same size, as the deflecting forces are too slight to bend them visibly. It will be seen that here, also, alternately opposite flexural stresses are produced in the longitudinals b, which by pressing frictionally against the corners of the ties at and against the inner sides of the eyes 0 of the girths a, give a frictional contact sufiicient to hold them in place.

As illustrated in Figs. 5 to 9, the column for which the skeleton-frame is prepared in accordance with my invention may be of any desired shape. Fig. 5 shows a girth adapted to a fiat column having but two Fig. 6, one for a column of triangular section; Fig. 7 one for Q a square column; Fig. 8 one for an octagonal column; and Fig. 9 one for a large flat column or portion of a partition or dividing a wall.

drawing may each comprise several rods, as 1n actual practice is commonly the case; and

principle, which come properly within the I scope of-the appended'claims, are intended tobe included therein.

Having thus described my invention,

Letters Patent is 1; A skeleton framework for reinforced concrete structures, embodying a plurality of longitudinal members and a plurality of rigid transverse members, the latter being inthe'form of closed polygons having eyes at their angles through which said longitudinal members pass, successive transverse members of the frame work being skewed in opposite alternate directions, whereby they bind each and all of them in theirmembers being deviated from their normal ency, and a plurality of transverse members each consisting of a rigid rod bent in the other such variations embodying the same form of a closed figure encompassing said longitudinal members, alternate transverse members having eyes turned thereon 3 through which said longitudinal members pass, what I clalm as new and desire to secure by said members having portions distorted to frietionally bind each other.

4. A skeleton framework for reinforced concrete structures, embodying a plurality of longitudinal members possessing some resiliency, and a plurality of transverse members each consisting of a rigid rod bent in the form of a closed figure encompassing said longitudinal members, alternate transverse members being provided with eyes through which said longitudinal members pass and said transverse members reactively distortionally holding the longitudinal members and being retained by them frietionally in place.

In witness whereof, I have hereunto set my hand this thirteenth day of April, 1907.

RUDOLPH B. HARTMAN.

In presence of Joe. M. GINBER, ELsIE M. Horz.

Oopiu of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

' Washington, I). C." 

